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James, I suppose that particulars make a difference, so depending on your unit, all of the answers to your question might be right to one degree or another. I built an addition onto my house and retrofit the whole house with a new central heat / air system that I bought via the internet from a guy in Indiana. The furnace came equipped for natural gas but also had provision to switch to propane. I did the switch to propane and have used the system successfully for about 5 years now. As farmered said, I bought a 250 lb. propane tank, a high pressure regulator for on the tank, a low pressure regulator for use where the gas enters the house, copper pipe outside the house, black iron pipe inside the house, and a condensate drip line where the black pipe connects to the gas valve in the furnace. I replaced the gas orifices in the burner really easily using a straight blade screwdriver, and in my case, that's all I had to change. The gas valve works great. I happen to have an electric igniter in mine so I don't know about changing the pilot light, but I think that probably would also have to be changed if I had one. One other thing that I did too, I borrowed a pressure gauge from a friend of mine to check the gas pressure at the valve. It needed to be at 11 column inches of water pressure for my furnace to work properly. I could have adjusted my low pressure valve to regulate the pressure if I had needed to do so, but it turned out that the pressure was already at 11 inches so I didn't even have to adjust the low pressure regulator. By the way, I don't have any idea how to convert column inches to psi, but I do know that 11 columns inches is VERY low pressure. I think it is only around 1 or 2 PSI. I also bought a new gas range and made the same simple changes to the orifices in that so that it would work on propane. No other changes were needed to the gas range, but it too has electric igniters instead of pilot lights. So, I guess the message is that you need to check with the furnace manufacturer and acquire a propane conversion kit from them. It might be a simple conversion. Good luck, Tom
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